## 
## ======================================================================================
##                                                           Dependent variable:         
##                                                  -------------------------------------
##                                                  Number of un-identified sp varieties 
##                                                          (1)                (2)       
## --------------------------------------------------------------------------------------
## Distance to the nearest research or trial center      0.0002***                       
##                                                       (0.00003)                       
##                                                                                       
## Distance to the nearest trial center only                                 0.00002     
##                                                                          (0.00002)    
##                                                                                       
## Constant                                              10.265***          14.409***    
##                                                        (1.407)            (1.315)     
##                                                                                       
## --------------------------------------------------------------------------------------
## Observations                                             108                108       
## R2                                                      0.153              0.010      
## ======================================================================================
## Note:                                                      *p<0.1; **p<0.05; ***p<0.01
## 
## =====================================================================================
##                                                          Dependent variable:         
##                                                  ------------------------------------
##                                                  Share of un-identified sp varieties 
##                                                         (1)                (2)       
## -------------------------------------------------------------------------------------
## Distance to the nearest research or trial center     0.00000***                      
##                                                      (0.00000)                       
##                                                                                      
## Distance to the nearest trial center only                               -0.00000     
##                                                                         (0.00000)    
##                                                                                      
## Constant                                              0.338***          0.505***     
##                                                       (0.034)            (0.033)     
##                                                                                      
## -------------------------------------------------------------------------------------
## Observations                                            108                108       
## R2                                                     0.236             0.0002      
## =====================================================================================
## Note:                                                     *p<0.1; **p<0.05; ***p<0.01
## 
## ===================================================================================
##                                                         Dependent variable:        
##                                                  ----------------------------------
##                                                  Number of identified sp varieties 
##                                                         (1)              (2)       
## -----------------------------------------------------------------------------------
## Distance to the nearest research or trial center    -0.0001***                     
##                                                      (0.00004)                     
##                                                                                    
## Distance to the nearest trial center only                              0.00001     
##                                                                       (0.00002)    
##                                                                                    
## Constant                                             19.811***        14.384***    
##                                                       (1.620)          (1.472)     
##                                                                                    
## -----------------------------------------------------------------------------------
## Observations                                            108              108       
## R2                                                     0.099            0.004      
## ===================================================================================
## Note:                                                   *p<0.1; **p<0.05; ***p<0.01

Loess for distances vs. un-identified varieties

Analyzing identified varieties

Varietal cluster for the most common sp varieties